2024-10-29 05:12:06 +03:00
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From c4fde0d177bdb33912f450914d84d6432391a8b5 Mon Sep 17 00:00:00 2001
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From: Mario Limonciello <mario.limonciello@amd.com>
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Date: Sat, 12 Oct 2024 12:45:16 -0500
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Subject: cpufreq/amd-pstate: Use nominal perf for limits when boost is
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disabled
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When boost has been disabled the limit for perf should be nominal perf not
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the highest perf. Using the latter to do calculations will lead to
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incorrect values that are still above nominal.
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Fixes: ad4caad58d91 ("cpufreq: amd-pstate: Merge amd_pstate_highest_perf_set() into amd_get_boost_ratio_numerator()")
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Reported-by: Peter Jung <ptr1337@cachyos.org>
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Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219348
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Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
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---
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drivers/cpufreq/amd-pstate.c | 20 ++++++++++++++------
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1 file changed, 14 insertions(+), 6 deletions(-)
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--- a/drivers/cpufreq/amd-pstate.c
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+++ b/drivers/cpufreq/amd-pstate.c
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@@ -566,11 +566,16 @@ static int amd_pstate_verify(struct cpuf
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static int amd_pstate_update_min_max_limit(struct cpufreq_policy *policy)
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{
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- u32 max_limit_perf, min_limit_perf, lowest_perf;
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+ u32 max_limit_perf, min_limit_perf, lowest_perf, max_perf;
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struct amd_cpudata *cpudata = policy->driver_data;
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- max_limit_perf = div_u64(policy->max * cpudata->highest_perf, cpudata->max_freq);
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- min_limit_perf = div_u64(policy->min * cpudata->highest_perf, cpudata->max_freq);
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+ if (cpudata->boost_supported && !policy->boost_enabled)
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+ max_perf = READ_ONCE(cpudata->nominal_perf);
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+ else
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+ max_perf = READ_ONCE(cpudata->highest_perf);
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+
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+ max_limit_perf = div_u64(policy->max * max_perf, policy->cpuinfo.max_freq);
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+ min_limit_perf = div_u64(policy->min * max_perf, policy->cpuinfo.max_freq);
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lowest_perf = READ_ONCE(cpudata->lowest_perf);
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if (min_limit_perf < lowest_perf)
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2024-12-05 18:46:18 +03:00
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@@ -1504,10 +1509,13 @@ static int amd_pstate_epp_update_limit(s
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2024-10-29 05:12:06 +03:00
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u64 value;
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s16 epp;
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- max_perf = READ_ONCE(cpudata->highest_perf);
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+ if (cpudata->boost_supported && !policy->boost_enabled)
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+ max_perf = READ_ONCE(cpudata->nominal_perf);
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+ else
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+ max_perf = READ_ONCE(cpudata->highest_perf);
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min_perf = READ_ONCE(cpudata->lowest_perf);
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- max_limit_perf = div_u64(policy->max * cpudata->highest_perf, cpudata->max_freq);
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- min_limit_perf = div_u64(policy->min * cpudata->highest_perf, cpudata->max_freq);
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+ max_limit_perf = div_u64(policy->max * max_perf, policy->cpuinfo.max_freq);
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+ min_limit_perf = div_u64(policy->min * max_perf, policy->cpuinfo.max_freq);
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if (min_limit_perf < min_perf)
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min_limit_perf = min_perf;
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